"""
員工 Model
"""
from datetime import datetime, date
from typing import Optional, List, TYPE_CHECKING

from sqlalchemy import String, Integer, Boolean, DateTime, Date, ForeignKey
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.core.database import Base

if TYPE_CHECKING:
    from app.models.department import Department
    from app.models.kpi_sheet import KPISheet
    from app.models.notification import Notification


class Employee(Base):
    """員工"""

    __tablename__ = "KPI_D_employees"

    id: Mapped[int] = mapped_column(primary_key=True)
    employee_no: Mapped[str] = mapped_column(String(20), unique=True, nullable=False)
    name: Mapped[str] = mapped_column(String(100), nullable=False)
    email: Mapped[str] = mapped_column(String(200), unique=True, nullable=False)
    password_hash: Mapped[str] = mapped_column(String(200), nullable=False)
    department_id: Mapped[int] = mapped_column(ForeignKey("KPI_D_departments.id"), nullable=False)
    manager_id: Mapped[Optional[int]] = mapped_column(ForeignKey("KPI_D_employees.id"))
    job_title: Mapped[Optional[str]] = mapped_column(String(100))
    role: Mapped[str] = mapped_column(String(20), default="employee")  # employee, manager, admin, hr
    status: Mapped[str] = mapped_column(String(20), default="active")  # active, inactive, resigned
    hire_date: Mapped[Optional[date]] = mapped_column(Date)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    # Relationships
    department: Mapped["Department"] = relationship("Department", back_populates="employees")
    manager: Mapped[Optional["Employee"]] = relationship(
        "Employee", remote_side=[id], back_populates="subordinates"
    )
    subordinates: Mapped[List["Employee"]] = relationship(
        "Employee", back_populates="manager"
    )
    kpi_sheets: Mapped[List["KPISheet"]] = relationship(
        "KPISheet", back_populates="employee", foreign_keys="KPISheet.employee_id"
    )
    notifications: Mapped[List["Notification"]] = relationship(
        "Notification", back_populates="recipient"
    )

    @property
    def is_manager(self) -> bool:
        """是否為主管"""
        return self.role in ("manager", "admin")

    @property
    def is_admin(self) -> bool:
        """是否為管理員"""
        return self.role == "admin"

    @property
    def is_hr(self) -> bool:
        """是否為人資"""
        return self.role == "hr"

    def __repr__(self) -> str:
        return f"<Employee {self.employee_no}: {self.name}>"